Coil for electrical machines.



. PATENTED DEC. 22, 1903.

I. DE KAISER. COIL FOR ELECTRICAL MACHINES.

APPLICATION FILED MAY 1, 1903.

N0 MODE-Ii.

mmvron UN T-ED STATES.

Patented December 22, 1903.

PATENT OFFICE.

ISAAC DE KAISER, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO WEST- INGHOUSE ELECTRIC & MANUFACTURING COMPANY,-A CORPORATION OF PENNSYLVANIA.

COIL FOR ELECTRICAL MACHINES.

SPECIFICATION forming part of Letters Patent No. 747,595, dated December 22, 1903. Application filed May 1, 1903- Serial No. 155,236. (No model.)

To aZZ whom it may concern:

Be it known that I, ISAAC DE KAISER, a citizen of the United States, and a resident of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Coils for Electrical Machines, of which the following is a specification.

My invention relates to field-magnet coils for electric railway-motors and similar apparatus; and it has for its object to provide a coil of simple,compact,and durable construction having terminal leads projecting from adjacent layers at a place where they are most accessible.

My invention is illustrated in the accompanying drawings, in which- Figure 1 is a plan view of a strap-wound and Fig. 2 is a perspective view of a coil without insulation and having comparatively few turns, which are spread apart to clearly indicate the coil structure.

The complete coil comprises two substantially concentric strap coil-sections 1 and 2, which are separated by a. suitable insulationspace. consists of approximately one-half the total number of turns, those in section 1 being continuous or in simple series, while section 2 is divided into two parts 2 and 2", which may or may not contain equal numbers of turns. One end 3 of part 2 of section 2 is riveted and soldered or otherwise electrically connected to one end 4 of section 1 at one of the outer sides or faces of the coil, and the other end 5 of section 1 is similarly secured to one end 6 of part- .2 of section 2 at the opposite side or face of the coil, sections 1 and 2 being oppositely wound in order thatsaid connections may be neatly made within a minimum amount of space. As shown in Fig. 2, the leads 7 and 8 are brought out from adjacent turns of section 2, said leads being arranged for connection to wires or cables. 1 The current may be considered asentering at lead 7, going through part 2 of section 2 to the end of 3, then through section 1 from the end 4 to the end 5, and finally through the part2 of Each of the said concentric sectionssection 2 from the end 6 to the lead 8. Obviously the current may be supplied to the coil so as to traverse it in the opposite direction, if desired.

It is evident that I have devised a coil of such construction that the terminal leads may be attached to any two adjacent turns, whereby a minimum amount of space is required to contain the coil and leads and whereby the leads are made more easily accessible than they otherwise would be.

I do not intend to limit my invention to the exact form of coil shown in the drawings or to one composed of sections having equal nu mbers of turns. It is also obvious that by properly designing the winding the leads may be brought out from any two adjacent turns of either of the sections, that the conductors of which the coil-sections are formed may be of different cross sectional form from that shown, and thatif of strap form they may be bent sidewise instead of edgewise.

I claim as my invention 1. Acoilcomprisingtwoconcentricportions wound in opposite directions and having leads projecting from adjacent turns of the outer portion.

2. Acoil comprising two concentric portions connected together in series and having its two terminal leads projecting from adjacent turns of the outer portion.

3. A strap-coil comprising two concentric sections having their ends fastened together to provide a series connection and terminal the free ends of the outer section lengths benected together in series to form a. single uniing located in juxtaposition and provided directional circuit, and terminal leads prowith terminal leads for the coil. jecting from adjacent turns of one of the sec- 7. A field-magnet coil comprising two contions.

5 centric sections of metal strap wound in op- In testimony whereof I have hereunto sub- I5 posite directions and connected in series and scribed my name this 16th day of April, 1903. terminalleads projecting from adjacent turns ISAAC DE KAISER. of the outer section. Witnesses:

8. A field-magnet coil comprising two sec- LEO J. MILLER,

10 tions coiled in opposite directions and con- JAMES B. YOUNG. 

